"Hash browns serve as the bottom crust in this multi-layered marvel...."
INGREDIENTS
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16 large eggs
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1 1/4 cups heavy cream
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1 1/2 teaspoons kosher salt plus more
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3/4 teaspoon freshly ground black pepper plus more
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5 tablespoons unsalted butter, divided
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12 ounces fresh breakfast sausage links
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2 cups sliced leeks, white and pale-green parts only
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2 russet potatoes (1 1/2 pounds), peeled, shredded, lightly squeezed
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1 pound frozen spinach, thawed, squeezed dry, roughly chopped
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1 1/2 cups (4 ounces) grated Gruyère
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1/2 cup (1 1/2 ounces) grated Parmesan